với sự phức tạp của bộ nhớ đệm chẳng hạn như bộ nhớ cache hết hạn, cập nhật, và quản lý bộ nhớ. Có hai loại khác nhau của bộ nhớ đệm trong ASP. NET: cung cấp một bộ điều khiển, các lớp học, và các công cụ quản lý để xác thực người dùng với các hình thức web và lưu trữ thông tin người dùng trong cơ sở dữ liệu. | 86 Part I Getting Started with Microsoft Visual Basic 2008 As I mentioned earlier you may open either the project file Input or the solutions file Input to open solutions with only one project. In either case the Input Controls project opens in the IDE. 3. If the project s form isn t visible click the form in Solution Explorer and then click the View Designer button. 4. Move or c lose the windows that block your view of the form so that you can see how the objects are laid out. You see a form similar to this The Input Controls form contains radio button check box list box combo box picture box button and label objects. These objects work together to create a simple order entry program that demonstrates how the Visual Basic input objects work. When the Input Controls program is run it loads images from the c vb08sbs chap03 input controls folder and displays them in the six picture boxes on the form. Note If you installed the practice files in a location other than the default c vb08sbs folder the statements in the program that load the artwork from the disk contain an incorrect path. Each statement begins with c vb08sbs chap03 input controls as you ll see soon. If this is the case you can make the program work by renaming your practice files folder vb08sbs or by changing the paths in the Code Editor by using the editing keys or the Quick Replace command on the Edit menu. 5. Click the Start Debugging button on the Standard toolbar. The program runs in the IDE. 6. Click the Laptop radio button in the Computer box. Chapter 3 Working with Toolbox Controls 87 The image of a laptop computer appears in the Products Ordered area on the right side of the form. The user can click various options and the current choice is depicted in the order area on the right. In the Computer box a group of radio buttons is used to gather input from the user. Radio buttons force the user to choose one and only one item from a list of possibilities. Radio
